But
lithium is placed by Crookes at the head of a group, the other members of
which are potassium, rubidium and caesium (the last not examined). Following
these identities of composition, I think it is better to remove manganese
and fluorine from their incongruous companions and place them with lithium
and its allies as V _a_, the Spike Groups, marking, by the identity of
number, similarities of arrangement which exist, and by the separation the
differences of composition. It is worth while noting what Sir William
Crookes, in his "Genesis of the Elements," remarks on the relations of the
interperiodic group with its neighbours. He says: "These bodies are
interperiodic because their atomic weights exclude them from the small
periods into which the other elements fall, and because their chemical
relations with some members of the neighbouring groups show that they are
probably interperiodic in the sense of being in transition stages."
Group V in every case shows fourteen bars radiating from a centre as shown
in iron, Plate IV, 1. While the form remains unchanged throughout, the
increase of weight is gained by adding to the number of atoms contained in
a bar.
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